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Connectivity Doctor
The Connectivity Doctor checks whether your listening port is reachable from the internet and produces a human-readable diagnostic certificate.
Open it by clicking the Connectivity Doctor button (activity/waveform icon) in the toolbar.
When you open the modal, probes start automatically if no prior report exists. You can click Retest Network at any time to run a fresh test.
| Test | What it checks |
|---|---|
| Connectivity Certificate | A plain-text summary of whether your port was reached successfully |
| Port reachability | Whether an external probe can connect to your listening port |
| NAT traversal method | UPnP, NAT-PMP, or manual — whichever is available on your router |
The test results appear in the certificate text area. A successful test shows the port number and confirmation that it was reached. A failed test describes the specific probe failure.
Below the certificate, Nebulae lists any diagnostic findings — for example:
- Port is closed or filtered.
- UPnP is available but the mapping failed.
- The engine is not listening on the expected port.
If there are no findings, no issues were detected.
The modal includes an expandable Port-Forwarding Instructions section with step-by-step guides for common router types (ASUS, Linksys, and others). Expand it if you need to set up a manual port forward.
If the Connectivity Doctor reports the port is closed:
- Verify your listening port in Settings → Connection → Listening Port & Protocols.
- Follow the port-forwarding instructions in the modal for your router.
- If you use a firewall, ensure it allows incoming TCP/UDP on your listening port.
- Re-run the test after making changes.